@IBAction func registerButtonPressed(_ sender: Any) {
    guard let username = usernameTextField.text, let password = passwordTextField.text, username.count > 0, password.count > 0 else {
      return
    }
    APIClient.register(withUsername: usernameTextField.text!, password: passwordTextField.text!)
  }

  @IBAction func loginButtonPressed(_ sender: Any) {
    guard let username = usernameTextField.text, let password = passwordTextField.text, username.count > 0, password.count > 0 else {
      return
    }
    APIClient.login(withUsername: usernameTextField.text!, password: passwordTextField.text!)
  }